Meninges:

CT coverings of the

brain and spinal cord.

Meninges: Dura Mater:

Tough Mother - superficial; 2 layers mostly fused together except at dural sinuses (venous blood).

Meninges: Dura Mater: Periosteal:

the periosteum of the skull plates.

Meninges: Dura Mater: Meningeal:

the heaviest part of the sheet.

Meninges: Arachnoid:

the middle menix - loose layer.

Meninges: Arachnoid:

Spider web like extensions:

connect to pia mater.

Meninges: Arachnoid: Arachnoid Villi:

extend up into dural sinuses.

Absorb CSF from subarachnoid space

and return it to venous circulation.

Meninges: Pia Mater:

Delicate Mother - loose areolar

CT attached to surface of brain.

CSF (cerebrospinal fluid):

a filtrate of the blood.

CSF: Produced by:

chriod plexuses in each ventricle

(network of capillaries).

CSF: Movement:

arterial blood [image] choroid plexus [image] CSF, moves through ventricles [image] subarachnoid space around brain and SC [image] arachnoid villi [image] venous blood (dural sinus [image] int jugular)

CSF: Color:

clear.

Blood Brain Barrier:

the capillaries that feed the brain are

different than the rest of the body.

 Has an extra thick basement membrane.

Blood Brain Barrier: Endothielial cells:

joined by tight junctions.

Most impermeable of all capillaries:

wastes, toxins, and most antibiotics

do not pass through easily.